Bondo dust gets everywhere. Wear a mask when sanding it, and work in a well-ventilated area. Also, buy or borrow an electric sander; sanding isn’t fun in the first place, and doing everything by hand would take forever. You really don’t need a whole lot of power tools to restore a cabinet, but a sander is one of ’em.
Here’s the cabinet with finished wood repairs and a coat of primer. I filled in a handful of holes and repaired the corners, working in layers until I got the shape and fill I desired. I was pretty proud of my bondo work, corners turned out fine and the holes were untraceable after the first coat of paint. Not too bad for my first time using the stuff.
Here’s the note I wrote to myself as a reminder to drill out the four coin box bracket holes I’d just filled in and painted over. Sigh.